/**
 * 数据库连接
 */
 const mongoose = require('mongoose')
 const config = require('./env')
 const log4js = require('./../utils/log4j')
 
 mongoose.connect(config.URL,{
     useNewUrlParser: true,
     useUnifiedTopology: true
 })
 
 const db = mongoose.connection;
 
 db.on('error',()=>{
     log4js.error('***数据库连接失败***')
 })
 
 db.on('open',()=>{
     log4js.info('***数据库连接成功***')
 })